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Commander Scott Kelly landed safely in Kazakhstan after spending 340 days on the International Space Station. (NBC News)

Astronaut Scott Kelly has spent 340 days aboard the International Space Station. After a year of experiments – and photos – Kelly is set to return to Earth. (101)

NASA is planning a very big homecoming celebration in Houston as Scott Kelly prepares to return to Earth Tuesday night. He’s spent 340 days on the International Space Station, a record for an American astronaut, reports NBC’s Tom Coste...

Former International Space Station Commander Scott Kelly hands over command of the ISS to new commander, Tim Kopra. Kelly and two other crew members will come home tomorrow, and make room for new researchers in space. (NBC News)

Capt. Scott Kelly, the first American astronaut to spend nearly a year in space on a single mission, talks to Lester Holt about the end of his mission. (Nightly News)

In an NBC News exclusive, twin brothers Scott and Mark Kelly share a video from the space station with a stowaway gorilla. (101)

Named by Professor Stephen Hawking, "VSS Unity" will spend months in integrated testing before flight tests begins. (NBCNews.com)

Video taken by astronaut Tim Peake on the International Space Station showed a sparkling United Kingdom as the ISS flew west to east towards northern Europe. (NBC News)

Scientists say they've detected gravitational waves. So what does that mean? Columbia University Astrophysicist Summer Ash explains. (30 Seconds to Know)

Physicist David Reitze explains the breakthrough research behind proving Albert Einstein’s theory on ripples in space time known as gravitational waves (NBC News)

International Space Station astronaut Tim Peake captured dramatic time-lapse video of lightning strikes while in orbit over North Africa and Turkey. (NBC News)

The U. N. Security Council called North Korea’s rocket launch a dangerous move toward the development of a nuclear weapons delivery system (Nightly News)

The new Orion space capsule, designed to eventually carry a crew to Mars, is on display at Kennedy Space Center. WESH's Angela Taylor reports. (NBC News Channel)

On January 28, 1986, Space Shuttle Challenger was lost 73 seconds into its 10th flight, leading to the deaths of its seven crew members. (Flashback)

SpaceX released video of its Dragon 2 capsule successfully completing a propulsion hover test at the company's rocket development facility. (NBC News)

Caltech researchers may have discovered a new planet lurking in the outer reaches of our solar system. (Nightly News)

Space X's Elon Musk releases video showing the Falcon 9 rocket tipping, crashing and bursting into flames as it attempted a soft landing on a floating barge in the Pacific Ocean. (NBC News)

SpaceX made history again on Jan. 17 by launching a Falcon 9 rocket into orbit. (NBC News)

Astronauts abroad the International Space Station conduct a six-and-a-half hour spacewalk to replace equipment that is faulty. (NBC News)

Streaking fireball spotted over Nevada and California Tuesday night was Russian space debris, U.S. defense officials said. (NBC News)

Meteorologist Danielle Banks discusses how a new 3D printed rocket engine was recently successfully tested and how it could revolutionize the future of space travel. (NBC News)

As Meteorologist Danielle Banks explains, you may want to head outside and peer into the night sky, because something is happening we'll never have a chance to see again. (NBC News)

Jubilation greeted the safe return of rocket's first stage, the first time SpaceX had returned a rocket to dry land and the first successful recovery from orbital flight. (NBC News)

NASA astronauts go on a spacewalk Monday morning to move a stuck railcar before the arrival of a resupply mission. (NBC News)

Russian Soyuz rocket carrying an international crew, including Britain's first official astronaut, Tim Peake, blasted off for the International Space Station. (NBC News)